Electric lamp



J. H. IRWIN.

ELECTRIC LAMP.

(No Model.)

Patented Nov. 29,1881.

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UNITED STATES JOHN H. IRWIN, OF MORTON, PENNSYLVANIA.

ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 250,149, dated November 29,1881.

Application filed June 30, 1881. (No model.)

To all whom it may concern:

Be it known that I, JOHN H. IRWIN, of Morton, in the county of Delaware and State of Pennsylvania, have invented certain new and useful Improvements in Electric Lamps, of which the following is a full, clear, and exact description, reference being had to the accompanyin g drawings and the letters marked thereon.

My invention relates especially to that class of devices known as incandescent lamps, and has for its object the production of an illuminating-lamp wherein the filament of carbon is held horizontal and in such a manner as to relieve it of all strain, permitting expansion and contraction to take place, and also in the peculiar method of arranging the lamp so as to be easily removed from its support; and my invention involves certain novel and useful combinations or arrangements of parts and peculiarities of construction and operation, all of which will be hereinafter first fully described, and then pointed out in the claims.

In the drawings, Figure 1 is a sectional view of one form of lamp, and Fig. 2 is a like View of another form of my improved lamp, showing all the parts. Fig. 3 is a view of the platinum connection with the carbon shown in Fig. 2, and Fig. 4 is a horizontal section of the same at line a: w of Fig. 3.

Like letters of reference, wherever they occur, indicate corresponding parts in all the figures.

In constructing the wall of the lamp A, and the introduction and location of the interior parts, I employ the method fully described in the application of William L. Voelker for patent for improvement in electric lamps, filed June 24, 1881.

In Fig. 1 theplatinum connections B,with the horizontal filament of carbon 0, are united by hard or silver solder, as described in the abovementioned application of Voelker. 1 make said platinum connections as fine as consistent with low resistance, in order to permit free expansion and contraction of the carbon. By use of the horizontal filament the same is not dis= torted or fractured by the passing current of electricity. Other forms of carbon than that shown in the drawings might be employed, 1

either a single curve or the use of a spiral form not departing from the principle of my improvement.

In Fig. 2 is shown ahanging lamp. The platinum connections with the carbon are bent in form, allowing the same to be suspended just below or near the center ofthe bulb ofthe lamp. The platinum supports or connections are flattened out at b, so as to givethe same a slight spring, thus taking up any longitudinal expansions of the carbon. Said connections pass through each end of the bulb, and may be smoothly bent upon the exterior of the glass, as shown at D.

E E are flexible supporting-arms, of metal, connected with the line-wires of the circuit.

Theyare held in-place above the lamp by means of the bolt cl, passing through the insulatingpiece F, composed of hard rubber or other suitable material. The extremities of supportin arms E are formed into caps or sockets G, fitting over the ends of the bulb A, and conforming to the shape thereof. Arms E are sufficiently light and elastic in character to pass easily over the ends of the bulb, holding the same firmly in position. The sockets or caps G press against the extremities of the platinum wires passing to the interior of the lamp, and complete the circuit. Ooncavities might be formed at the points where the platinum wires pass through the bulb and the convex surfaces of the caps fitted therein. The arms might also be made to embrace the lamp at other points opposite to one another-4s, for instance, upon opposite sides of the neck or contracted portion thereof-suitable projections being formed in the glass at these points and the conductingwires there passed through the walls of the bulb.

H is a reflector, of any suitable material, placed above the lamp, in order to throw the light downward. It is held in place by means of the adjustable bolt I, connecting it to the insulated piece F.

If desired, instead of supporting the'lamp as shown, the same may be mounted upon a post or standard, in which case reflector H may be placed above the lamp. The arrangement of the curved spring supports forms a simple and effective method of holding the reflector;

but the means for attaching said reflector at the point of union of the arms may be varied in many ways.

The lamp shown in Fig. 1 may be provided at base with a metal collar connecting with a suitable support, or placed in circuit in any ap proved manner.

By the use of my improved lamps,where they are placed in exposed positions, they may be readily and quickly taken down and put up without loss of time in making connections.

Having now fully described my invention, what I claim as new therein, and desire to secure by Letters Patent, is-

1. In an incandescent electric lamp, a filament of carbon secured at its extremities to thin platinum connections, said connections being flattened, so as to form yielding or springing supports, and lightly holding the filament ofcarbon in a horizontal position, substantially as shown and described.

2. In an incandescent electric lamp of the character herein specified, the combination, with the filament of carbon, of yielding springconneetions secured to and holding said filament at each extremity, said connections being flattened at the curve orbend therein, as shown, substantially as and for the uses and purposes shown and described.

3. In an electric lamp of the character herein specified, the combination, with the bent platinum connectionslf, flattened at the curved part thereof, of a filament of carbon united thereto and held in a horizontal position, substantially as set forth.

4. The combination, with a removable electric lamp suspended by means of flexible metallic arms, of the sockets or caps at the extremities of said arms, fitting over the ends of the bulb and forming electric connection with the platinum wires passing to the interior thereof, substantially as shown and described.

5. The oombination,witl1 the bulb of a removable electric lamp, of a supporting device consisting of two elastic arms provided with metal caps or sockets adapted to bear upon the lamp at diametrically-opposite points, so as to support the same and at the same time complete the electric connection, substantially as set forth.

6. The combination, with a removable lamp, of the metal spring supporting arms, the interposed insulating piece or strip, and the clamping-bolt, substantially as described.

7. The combination of the supporting and circuit-completing arms, adapted to embrace the lamp at diametrically-opposite points, and bolted together at one end, and areflector suspended from the arms at their point of union and placed between the arms directly over the lamp, substantially as shown and described.

8. In a removable electric lamp, the combination, with the platinum connections B, of the I arms E, bearing caps or sockets G, insulatingpieces F, and reflector H, the whole arranged to operate substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand in the presence of two witnesses.

JOHN H. IRWIN.

Witnesses:

F. W. HANAFORD, A. M. PIERCE. 

